Official NHA Assessment

Race 5: FOR HOSPITALITY BOOKINGS CALL 011 681 1796 GRADUATION PLATE (For Maidens, 1 & 2 Time Winners)

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Line Horse
Bristol Hercules
Reference for assessment
Exact Matches
1 / 7
Calculated = Official
Close Matches
1 / 7
Within 2 points
Significant Diffs
4 / 7
More than 5 points
Detailed Assessment
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Pos  Horse                Age  Weight  Fin  Lengths  WFA   Pre   Race Rating  New   Adj  
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1    King Harald          2    57.0    1    0.00     0.0   102   78           78    -24
2    Bristol Hercules     2    60.0    2    1.75     0.0   87    87           87    +0
3    Golden Operator      2    56.5    3    1.95     0.0   87    80           80    -7
4    Opera Fan            2    57.0    4    5.25     0.0   82    78           78    -4
5    Zip Code             3    57.0    5    5.75     4.0   79    70           70    -9
6    A Bit Of Class       2    54.5    6    8.15     0.0   98    73           88    -10
7    Sigrid Swing         4    56.5    7    9.05     2.0   71    73           73    +2
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 King Harald 102 102 78 +24 0.0 -
2 Bristol Hercules Line 87 87 87 ✓ Match 0.0
3 Golden Operator 87 87 80 +7 0.0 -
4 Opera Fan 82 81 78 +3 0.0 -
5 Zip Code 79 77 70 +7 4.0 -
6 A Bit Of Class 98 98 88 +10 0.0 -
7 Sigrid Swing 71 70 73 -3 2.0 -
Assessment Methodology
Calculation Steps:
  1. Identify Line Horse - consistent performer used as reference
  2. Calculate WFA Allowance based on age, distance, and month
  3. Apply Drag Adjustment for beaten margin
  4. Calculate Actual Weight Performance:
    Weight - Drag - WFA
  5. Compare to Line Horse to determine race rating
  6. Apply special rules (maiden caps, layoff allowance)
Key Formulas:
  • Drag Effect: Varies by distance (see Benchmarks page)
  • 1 length ≈ 1kg at 1 mile (1600m)
  • WFA Scale: Based on Admiral Rous's 1855 table
  • Rating Points: 1kg = 2 rating points